\documentclass[a4paper, 12pt]{article}

\begin{document}

This is the first paragraph of a typical document. It is produced in a `12~point' size. A \textit{point} is a unit of length used by printers. One point is approximately $1/72$~inch. In a `12~point' font the height of the parentheses is 12~points (i.e. about $1/6$~inch) and the letter~`m' is about 12 points long.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

This is the second paragraph of the document. There are also `10~point' and `11~point' styles available in \LaTeX. The required size is specified in the `documentstyle' command. If no such size is specified then the 10~point size is assumed.

\end{document}
